#!/usr/bin/perl -w
#
# Copyright (C) 2006, 2007, 2012  Internet Systems Consortium, Inc. ("ISC")
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.

# $Id: doxygen-input-filter.in,v 1.4 2007/06/19 23:47:13 tbox Exp $

# Input filter for feeding our source code into Doxygen.

# Slurp whole file at once
undef $/;
$_ = <>;

# It turns out that there are a lot of cases where we'd really like to
# use what Doxygen calls "brief" documentation in a comment.  Doxygen
# has a shorthand way of doing this -- if one is writing C++.  ISC
# coding conventions require C, not C++, so we have to do it the
# verbose way, which makes a lot of comments too long to fit on a
# single line without violating another ISC coding standard (80
# character line limit).
#
# So we use Doxygen's input filter mechanism to define our own
# brief comment convention:
#
#	/*% foo */
#
# expands to
#
#	/*! \brief foo */
#
# and
#
#	/*%< foo */
#
# expands to
#
#	/*!< \brief foo */
#
s{/\*%(<?)}{/*!$1 \\brief }g;

# Doxygen appears to strip trailing newlines when reading files
# directly but not when reading from an input filter.  Go figure.
# Future versions of Doxygen might change this, be warned.
#
s{\n+\z}{};

# Done, send the result to Doxygen.
#
print;
